Taylor Swift: Quitting country music seemed to work out for the singer as 1989 reportedly generated about $12 million its first week. "I wanted to make a song that would help people get through their day," said Taylor, who earned three GRAMMY nominations this year. "The things that they're going through are parallel with the things I go through -- just on a different scale."

1989 had the biggest week in sales since the release of The Eminem Show in 2002, which sold 1.32 million copies.

Pharrell: The 41-year-old powerhouse producer had plenty to be "Happy" about in 2014, as his smash single spent multiple weeks on top of charts this year. "Happy" appears on his GRAMMY-nominated album GIRL. "First day out [the album] was like No. 1 in like 70 countries," Pharrell excitedly told ET.

Beyonce: This was the biggest year of Queen Bey's career, as she raked in an average of nearly $2.5 million a night in every city of her On the Run tour with husband Jay Z. She's also up for six GRAMMY awards, including Album of the Year for Beyonce, which made her the most GRAMMY-nominated woman in history.

Garth Brooks: Country's biggest name sold more than 1 million concert tickets in four months, and there wasn't a dry eye in the house when he performed "Mom" on the ET stage. "I love this song," Garth told ET. "It should have been written 50 years ago. Talk about a song idea! How about God talking to this unborn child right before this baby goes down to Earth, and God describing what a mom is? This song kills me."

Luke Bryan: Country music's sexiest man is also one of the richest country singers, with his worth being estimated at about $275 million. "Any time you get recognized for being good looking or handsome or sexy, it's flattering," said Luke, whose That's My Kind of Night tour brought in more than $55 million.